Synthesis and characterization of aniline-dimer-based electroactive benzoxazine and its polymer

Abstract

Benzoxazine incorporating an aniline dimer in its structure has satisfactory electroactivity and undergoes both amine-catalyzed and autocatalytic polymerization.

Development of Prosopis juliflora carbon-reinforced PET bottle waste-based epoxy-blended bio-phenolic benzoxazine composites for advanced applications

“…The positive E corr shi from anodic to cathodic with lower values of corrosion current can be attributed to a decrease in the oxygen concentration at the metal surface and a greater barrier effect against dissolved ions in water, which arises from the higher cross-linking density, less porous nature, compact molecular structure and better compatibility with MS plates. 66 From the results obtained, it is suggested that the PET bottle waste-based epoxy blended biophenolic benzoxazine composites developed in the present work can be used as coating materials for high performance industrial applications.…”

High-Performance and Degradable Polybenzoxazine/VU Vitrimer and Its Application for Carbon Fiber Recycling

“…34 To ensure that 1,4-BCBA can completely react with amine cross-linkers to form reversible units during the curing process, suitable curing conditions were determined to separate the reaction process of amine-catalyzed BA-a from that of amines with 1,4-BCBA. 36 First, to investigate the effect of the reaction between primary amine and BA-a on the conversion of 1,4-BCBA during the low-temperature curing of the blends, the BA-a/1,4-BCBA/TEAE and BA-a/1,4-BCBA samples were heated at 60 °C for 1 h. The results of 13 C NMR analysis on the postreaction samples are shown in Figure 1. After curing BA-a/1,4-BCBA for 1 h at 60 °C, the 13 C NMR analysis of the blended system (Figure 1a) showed no change in the C�O carbon signal peak.…”

Corrosion Resistance of Mild Steel Coated with Phthalimide-Functionalized Polybenzoxazines

“…In contrast, the poly(oPP-BZ) 180 coating had the lowest value of Q dl of 0.069 ± 0.03 µΩ −1 •s n •cm 2 . A higher value of R ct and a lower value of Q dl always correspond to better corrosion resistance performance, because of the inhibited access of water molecules to the metal surface (through the adsorption of the organic molecules) and a less active dissolution reaction [29,68]. In addition, we suspect that the change in the coating resistance (R p ) was mainly due to the change in the penetration permeability of the electrolyte through the porous coating.…”

“…The incorporation of particular functional groups into PBZ coatings can enhance their adhesion to metal substrates and improve the corrosion resistance; for example, the charge transfer resistance (R ct ) of MS coated with a silane-based PBZ (1.2891 MΩ•cm 2 ) was higher than that of the uncoated MS (0.0396 MΩ•cm 2 ) [27]. Recently, PBZ-based electroactive species have been used to form protective passive oxide layers on steel substrates to prevent their corrosion [28][29][30]. For example, coating MS with PBA-ddm has resulted in excellent corrosion resistance and a decrease in the corrosion current by two orders of magnitude relative to that of the uncoated MS [31].…”